DE102005055325C5 - Safety switching device for fail-safe disconnection of an electrical consumer - Google Patents

Safety switching device for fail-safe disconnection of an electrical consumer Download PDF

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Publication number
DE102005055325C5
DE102005055325C5 DE102005055325A DE102005055325A DE102005055325C5 DE 102005055325 C5 DE102005055325 C5 DE 102005055325C5 DE 102005055325 A DE102005055325 A DE 102005055325A DE 102005055325 A DE102005055325 A DE 102005055325A DE 102005055325 C5 DE102005055325 C5 DE 102005055325C5
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Prior art keywords
switching
potential
terminal
safety
circuit arrangement
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DE102005055325A
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DE102005055325B3 (en
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Ralf Bauer
Günter Hornung
Thomas Nitsche
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Pilz GmbH and Co KG
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Pilz GmbH and Co KG
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    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B9/00Safety arrangements
    • G05B9/02Safety arrangements electric
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/002Monitoring or fail-safe circuits
    • H01H47/004Monitoring or fail-safe circuits using plural redundant serial connected relay operated contacts in controlled circuit

Abstract

Safety switching device for fail-safe disconnection of an electrical load (26, 28), in particular in an automated system (10), with a first and a second terminal (36, 38) for connecting a first signaling switch (24a), with a third and a fourth A terminal (40, 42) for connecting a second signaling switch (24b), and having at least first and second switching elements (56, 58) adapted to generate a redundant output switching signal for switching off the load (26, 28), wherein the first terminal (36) is assigned a first static potential (UB), and wherein the third terminal (40) is assigned a different second static potential, the second terminal (38) being connected to the first switching element (56) is coupled, that the first switching element (56) via the first signaling switch (24a) with the first static potential (UB) connectable i St, and wherein the fourth terminal (42) is coupled to the second switching element (58) such that the second switching element (58) via the second signaling switch (24b) is connectable to the second static potential, further comprising a circuit arrangement (80, 86, 88, 90; 80, 92) for determining at least one further static potential at the second and / or fourth terminals (38, 42), wherein the circuitry (80, 86, 88, 90, 80, 92) is adapted to receive the redundant output switching signal in Controlling the dependence on the further static potential, and wherein the circuit arrangement (80, 92) includes a switching unit (62, 64, 66, 68, 76, 78) adapted to temporarily connect the second switching element (58) in parallel with the second switching element (58) second signaling switch (24b) to switch.

Description

  • The present invention relates to a safety switching device for fail-safe disconnection of an electrical load, in particular in an automated system, with a first and a second terminal for connecting a first indicator switch, with a third and a fourth terminal for connecting a second indicator switch, and at least one first and a second switching element, which are configured to generate a redundant output switching signal for switching off the load, wherein the first terminal is occupied with a first static potential, wherein the third terminal is assigned to a different second static potential, wherein the second terminal is coupled to the first switching element such that the first switching element via the first signaling switch to the first static potential is connectable, and wherein the fourth terminal with the second Schaltelem ent is coupled such that the second switching element via the second signaling switch with the second static potential is connectable.
  • State of the art
  • Such a safety switching device is known from an operating manual with the number 19 238-01 of the local applicant for the safety relay PNOZ ® X2.
  • Safety switching devices in the context of the present invention serve to switch off a dangerous machine or system fail-safe, if this is necessary for the protection of persons. The safety switching devices typically monitor the alarm signals from emergency stop buttons, safety gate switches, photoelectric sensors, light curtains and other safety-related signaling devices, and they are able to interrupt a power supply path to the monitored machine or system in response to these message signals. As can easily be seen, it is very important that the safety function is always guaranteed and that any failures in the safety switching device are either intercepted and / or detected early. Typically, safety switching devices are therefore redundant and / or constructed with self-test functions. At least with high safety requirements, the message signals to the safety switching device are redundant.
  • However, the error safety achievable by the redundancy is lost if a cross-circuit occurs in the connecting lines between the signaling devices and the safety switching device. A safety switching device for the higher safety categories of the European standard EN 954-1 (or for comparable requirements) therefore requires cross-circuit detection. In the case of the safety switching device mentioned at the outset, this is realized in that a two-channel signaling device, for example an emergency stop button with two redundant normally closed contacts, is connected to the terminals with separate lines, a first normally closed contact of the emergency stop button having the first potential is occupied, while the second NC contact is occupied by a second potential. Typically, the operating voltage of, for example, 24 V is used as the first potential, while the second potential is a counter potential, in particular ground. The safety switching device is internally formed so that a cross-circuit between the connection lines of the signaling device, for example due to cable crushing, leads to an electrical short in the safety switching device, and the short circuit has a strong increase in the current flowing in the safety switching device current result. The increased current triggers a fuse which is arranged in the input circuit of the safety switching device. As a result, the output switching elements are turned off. However, this known approach has the disadvantage that the trigger point of the fuse (as an overcurrent detection element) is temperature-dependent and thus inaccurate.
  • Out DE 44 23 704 C1 Another approach to detecting cross-circuits in safety switching devices is known. In this case, the output-side switching elements each have one of their terminals at a common ground potential, while the respective other terminals are at different positive and negative potential. However, this procedure presupposes that the safety switching device is supplied with an alternating voltage, from which the positive and negative potentials are generated. Therefore, this known approach is not readily transferable to safety switching devices that are supplied with a DC voltage.
  • Out DE 197 58 332 B4 Another safety switching device is known in which an overcurrent detection element in the form of an electronic fuse is used in the input circuit. To prevent an automatic restart of a monitored machine or system after the elimination of a cross-circuit, an optocoupler is arranged parallel to the fuse here. When the fuse responds, the optocoupler closes the input circuit of the safety switching device briefly and goes into latching. However, this known safety switching device has the already mentioned disadvantage that the trigger point of the fuse is temperature-dependent and thus inaccurate.
  • In addition to the methods described so far with static potentials on the signaling lines, there are dynamic methods to detect cross-circuits. As an example, be on DE 100 33 073 A1 . DE 197 02 009 C2 and DE 198 05 722 A1 directed. The dynamic methods use differently clocked signals on the connection lines to the signaling devices. As a result, the signals on the separate signal lines can be distinguished from one another, and a cross-circuit can be detected. The dynamic methods have the disadvantage that at least two different clock signals must be provided, which is associated with effort and makes the devices correspondingly expensive.
  • task
  • Against this background, it is an object of the present invention to provide a simple and cost-effective safety switching device, with which errors in the external wiring can be reliably and as early as possible to detect.
  • According to one aspect of the invention, this object is achieved by a safety switching device of the type mentioned in the introduction, having a circuit arrangement for determining at least one further static potential at the second and / or fourth connection terminal, wherein the circuit arrangement is also designed to control the redundant output switching signal in dependence to control from the further static potential.
  • The new safety switching device is based on the static approach and therefore does not require clock signals and clock generators. It uses two different static potentials on the connection lines to the signaling device to detect cross-circuits, preferably without complementary, for example, modulated clocks. For this purpose, the (inevitably also static) potential at the second and / or fourth terminal is measured and compared with the expected potential there. This comparison enables reliable cross-circuit detection without dynamic clock signals. Therefore, the new safety switching device can be realized at a similar cost as with the previously practiced static methods. In the preferred, device-internal provision of the potentials can be dispensed not only on clock generators, but also on terminals for taking out the clock signals, which allows a particularly small-scale implementation with a high security category.
  • In addition, the new safety switching device can be realized regardless of the type of power supply used, d. H. It can be realized both with a DC voltage supply and with an AC voltage supply. This allows for increased quantities and further contributes to a cost-effective implementation.
  • The further static potential at the second and / or fourth terminal can be detected in the form of a measured value, which is compared quantitatively with the known first and second potential. Alternatively or additionally, the further potential can also be determined qualitatively by means of a threshold value comparison. In this case, it is "only" checked whether the additional potential is greater or less than a defined threshold. This realization is particularly cost-effective and sufficient for the safety-related application, since it is only important to recognize whether there is a cross-circuit. In particularly preferred embodiments, it is not looked at any differences in the potentials at the terminals, but it is monitored whether the potentials at these terminals correspond to the conditions resulting from the circuit structure with faultless wiring. This makes it possible to dispense with the generation and imprinting of distinguishable, dynamic signals.
  • Advantageously, it can also be recognized with the new safety switching device whether the ohmic line resistance of the connecting lines is within a permissible range. This is particularly advantageous when the new safety switching device uses a (known per se) overcurrent detection element in the input circuit, since in these cases previously had to be limited by means of an installation specification of the permissible line resistance in the connection lines to the signaling devices to ensure a safe response. With the present invention, an early and automatic shutdown is possible if the line resistance reaches an inadmissibly high value.
  • Finally, the new safety switching device has the advantage that the cross-circuit detection - in contrast to the previous static methods - even before the closing of the switching elements and thus before switching on the machine or system is possible. In the previous safety switching devices with static cross-circuit detection, the overcurrent detection element could only respond to a cross-circuit when the output-side switching elements were closed.
  • Overall, the new safety switching device allows early and reliable detection of cross-circuits with static signals on the connecting lines to the signaling device. The above task is thus completely solved.
  • In a preferred embodiment, the circuit arrangement is designed to monitor the further potential relative to the first potential.
  • Preferably, the circuit arrangement of this embodiment sets the further potential in relation to the first or second potential and monitors whether the ratio, for example in the form of a quotient, adheres to a defined range of values. Alternatively or additionally, the circuit arrangement could also compare the further potential as an absolute measured value with a threshold value, the first and / or the second potential. However, in the preferred embodiment, the circuitry is independent of the absolute magnitude of the first and second potentials. Therefore, this embodiment can be operated without adjustments with different supply voltages.
  • In a further embodiment of the invention, the first potential is a high potential in terms of magnitude and the second potential is a magnitude low potential and the circuit arrangement is adapted to open at least one of the switching elements, if the further potential is smaller in magnitude than a defined threshold.
  • Not every cross-circuit in the connecting cables to the signaling switches is equally dangerous for the operation of the safety switching device. Above all, cross-connections which directly lead to the fact that actuation of the signaling switches can no longer be detected and / or the output-side switching elements can no longer open are dangerous. With the present embodiment is achieved in a very simple and cost-effective manner that these dangerous cross-circuits are recognized immediately, since a magnitude low potential at the second and / or fourth terminal is the result of such a dangerous cross-circuit, as shown below in the embodiments ,
  • In a further embodiment, the at least one further potential includes a third potential at the second connection terminal and a fourth potential at the fourth connection terminal.
  • This embodiment allows a double control on the "most dangerous" cross-circuit, namely a connection between the second and fourth terminal. Therefore, this embodiment leads to a very cost-effective manner to increased security.
  • In a further embodiment, the circuit arrangement is designed to determine the first potential. In further preferred embodiments, the circuit arrangement can also be designed to also determine the second potential.
  • As a rule, the first and the second potential are known in a safety switching device due to the supply voltage. A metrological determination of these potentials, however, allows even more accurate monitoring taking into account potential fluctuations. In addition, the safety switching device in this embodiment can automatically adapt to different supply voltages.
  • In a further embodiment, the circuit arrangement is redundant.
  • This configuration allows fail-safe monitoring of the external circuitry alone with the help of the new approach.
  • In a further embodiment, the circuit arrangement includes at least one integrated circuit, in particular a microcontroller, which is connected to the second and / or fourth terminal.
  • The connection of the integrated circuit with the second and / or fourth terminal may include intermediate components, provided that the circuit is able to detect the further potential by measurement. The embodiment is advantageous because the new safety switching device can be realized very inexpensively in this way with few components.
  • In a further embodiment, the circuit arrangement includes a switching unit, which is designed to switch the second switching element in parallel to the second signaling switch for a short time.
  • In other words, the switching unit of this embodiment is designed to short-circuit the second switching element via the signaling switch. If there is no cross-circuit in the external circuit, the second switching element must be de-energized during this switching time, which can be easily checked with the help of further potential. This embodiment is particularly advantageous in addition to a direct metrological determination of the further potential, because it can be implemented in a cost-effective manner a diverse redundancy.
  • In a further embodiment, the switching unit includes a diode bridge, in which the second switching element is arranged.
  • This embodiment allows a very cost-effective implementation in those cases in which the second switching element is supplemented with polarized components, in particular with electrolytic capacitors, which is often advantageous in safety switching devices of this type.
  • In a further embodiment, the circuit arrangement includes a threshold value sensor, in particular optocoupler, which is designed to determine the further potential.
  • In this embodiment, the further potential is not determined in the form of a measured value, but it is "only" determined whether the further potential exceeds or falls below a threshold. Since it essentially depends on the cross-circuit detection to determine whether or not there is a cross-circuit, such a qualitative evaluation is sufficient. It is also very inexpensive and particularly advantageous in combination with a switching unit, as described above.
  • In a further embodiment, the safety switching device includes an overcurrent detection element, in particular in the form of a PTC resistor, which is designed to open at least one of the switching elements in an overcurrent.
  • This embodiment combines the new approach with the known static method for protection against cross-circuits. This combination is particularly advantageous because the new potential determination also makes it possible to check the (inherently intact) connection lines with respect to their line resistance. Thus, the previously achieved alone by mounting instructions safety can be further increased. On the other hand, the use of an overcurrent detection element in the form of a fuse, such as a PTC resistor, is a very reliable, inexpensive, and proven method to quickly and safely shut down the monitored machine in the event of cross-circuiting.
  • It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.
  • embodiment
  • Embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description. Show it:
  • 1 a schematic representation of an automated plant, are used in the embodiments of the new safety switching device,
  • 2 a simplified representation of an embodiment of the new safety switching device in the form of an equivalent circuit diagram showing the on state,
  • 3 an equivalent circuit diagram of the safety switching device off 2 with possible cross-overs, and
  • 4 the equivalent circuit diagram 3 with another possible cross-circuit.
  • In 1 is a plant, are used in the embodiments of the invention, in their entirety by the reference numeral 10 designated.
  • The attachment 10 includes a robot 12 whose working space with a protective door 14 is secured. At the protective door 14 is an actuator 16 arranged with a safety door switch 18 interacts. The safety door switch 18 sits on a frame, on which the movable safety gate 14 when closed. The actuator 16 For example, it can be a transponder with the safety door switch 18 only in the closed state of the protective door 14 can communicate.
  • The safety door switch 18 is with a safety relay 20 connected, the message signals of the safety door switch 18 processed. In series with the safety relay 20 there is a second safety relay 22 where an emergency stop button 24 is connected as a signaling device. The safety switching devices 20 . 22 are compact safety switching devices in the sense of the present invention, which have a range of functions specified by the manufacturer.
  • With the reference numbers 26 . 28 are designated two contactors whose working contacts in the power supply path to the robot 12 lie. The shooter 26 . 28 are via the safety relays 20 . 22 powered, so that each of the safety relays 20 . 22 is capable of the robot 12 about the shooter 26 . 28 off. An operation control that controls the normal operation of the robot 12 controls is not shown for the sake of simplicity.
  • In 2 is a preferred embodiment of the invention with reference to the safety switching device 22 shown. Like reference numerals designate the same elements as before.
  • The safety relay 22 has a device housing 34 , with a variety of terminals for connecting the emergency stop button 24 , the shooter 26 . 28 and of possible other signaling devices and actuators (not shown here). With the reference numerals 36 and 38 are designated a first and a second terminal, to which a first normally closed contact 24a of the emergency stop button 24 connected. With the reference numbers 40 . 42 are a third and a fourth terminal designated, to which a second NC contact 24b of the emergency stop button 24 connected. With the reference number 44 is the line resistance R L of the connecting lines, via which the NC contacts 24a . 24b with the terminals 36 - 42 are connected.
  • Two additional connection terminals 46 . 48 serve to the safety relay 22 to supply with an operating voltage U B, for example, 24V. Other connection terminals 50 . 52 are intended to shooters 26 . 28 and to connect potential other consumers.
  • In the illustrated embodiment, the safety switching device 22 potential-free outputs in the form of relay contacts K1, K2, which are connected between the terminals 50 . 52 lie in line with each other. In such a case, to the terminals 50 a positive potential of for example 24 V is connected, and the contactors 26 . 28 be connected to the terminals 52 connected. About the relay contacts K1, K2, the contactors 26 . 28 be energized, or the current flow can be interrupted. As an alternative to this preferred application, however, the present invention can in principle also be used in safety switching devices which have potential-related semiconductor outputs.
  • The excitation coils of the relays K1, K2 are in 2 with the reference numbers 56 . 58 designated. As in 2 is shown, the exciter coil is located 56 of the relay K1 (hereinafter relay 56 ) with a connection to ground. With its other connection is the relay 56 device internally with the connection terminal 38 connected. For the sake of completeness, there is still a normally open contact of the relay in this connection 56 (for self-retention) as well as a resistance 60 represented, which is to be understood as a substitute resistance for further, not shown here components.
  • The terminal 36 is internally connected to a first static potential, namely the operating voltage U B. This potential is via the normally closed contact 24a of the emergency stop button 24 to the relay 56 guided.
  • The relay 58 lies in a diode bridge consisting of four diodes 62 . 64 . 66 . 68 , A first connection 70 is about a spare resistor 72 and a normally open contact of the relay 58 to the terminal 42 guided. The terminal 40 is connected to the ground potential (second potential according to the invention). Accordingly, the relay 58 via the second NC contact 24b of the emergency stop button 24 connected to the ground potential.
  • A second connection 74 of the diode network is with two transistors 76 . 78 connected. About the transistor 76 can the second connection 74 of the diode network to the first potential (operating voltage U B ) are connected. About the second transistor 78 can the connection 74 alternatively be connected to the second potential (ground).
  • With the reference number 80 is called a microcontroller, which is designed, inter alia, the transistors 76 . 78 mutually to each other to control the connection 74 either to the first potential U B or the second potential (ground) to connect. In addition, the microcontroller 80 with further transistors 81 and 82 connected. transistor 81 is connected in series to the excitation coil of the relay K1. transistor 82 lies as a series transistor in the supply of the supply voltage U B. With the help of the transistor 82 can the microcontroller 80 disconnect all the above-mentioned components of the supply voltage U B , which has, among other things, the consequence that the relay contacts K1, K2 fall off. Alternatively or additionally, the microcontroller 80 the relays K1 and K2 also via the transistors 76 and 81 switch off.
  • With the reference number 84 is a PTC resistor called, which works as a reversible fuse.
  • The microcontroller 80 is via test leads 86 . 88 . 90 connected to nodes at which it has the first potential and a third and a fourth potential at the terminals 38 and 42 can determine. In a preferred embodiment, the microcontroller has 80 several integrated A / D converters, with the help of which he can measure the analog potentials. Finally, in 2 another optocoupler 92 illustrated, the input side lighting element serial to the relay 58 in the diode network. The optocoupler 92 generates an output signal when the relay 58 is traversed by current, and this output signal is also the microcontroller 80 supplied (not shown here for reasons of clarity).
  • The operation of the safety relay 22 is as follows: In the switched-on and ready-to-operate state, a current flows via the normally closed contact 24a to the relay 56 , In addition, a current flows through the transistor 76 and the diode network 62 - 68 to the relay 58 , Both relays 56 . 58 are attracted, ie the corresponding normally open contacts K1, K2 are closed (not shown here at the output). The relays 56 . 58 are self-contained, as is well known to those skilled in the art. An even simpler equivalent circuit diagram for this operating state is in the 3 and 4 shown. The same reference numerals designate the same elements as before. For the sake of clarity, the line resistances 44 in each case a replacement resistor 2R L shown.
  • 3 shows three possible cross-circuits 96 . 98 . 100 between the terminals 36 - 42 , Another cross-circuit 102 is in 4 shown. From these crossings is the cross-circuit 102 in 4 most dangerous, since it can cause a current over the relay 56 . 58 flows, even if the normally closed contacts 24a . 24b both are open. The safety relay 22 would therefore not be able to react despite the open signaling switch. The robot 12 would continue to work, although the emergency stop button 24 was pressed. In contrast, at the cross-links 96 . 98 . 100 in 3 always at least one of the relays 56 . 58 de-energized when the normally closed contacts 24a . 24b of the emergency stop button 24 be opened. In the case of cross-circuiting 98 will also be the backup 84 respond immediately, since the operating voltage U B is immediately short-circuited.
  • The "dangerous" cross-circuit 102 is according to 4 detected by looking at the potential at the terminals 38 and or 42 determined and with the measured or known potential at the terminal 36 compares. In the case of cross-circuiting 102 is the potential at the terminal 38 due to the transverse path via the normally closed contact 24b significantly lower than without cross-connection 102 , This potential difference can be achieved with the help of the microcontroller 80 easily recognized. Preferably, the microcontroller forms and monitors 80 a quotient of the third potential at the terminal 38 and the first potential at the terminal 36 , In one embodiment, the microcontroller checks 80 whether this quotient is greater than 0.75 (75%). If this is the case, one can assume that no cross-circuit 102 is present. In addition, the potential is at the terminal 42 in the case of cross-circuiting 102 approximately equal to the potential at the terminal 38 what the microcontroller 80 also monitored.
  • Similarly, by a plausibility comparison of the potentials at the terminals 36 . 38 and 42 a cross-circuit 96 or 100 ( 3 ), a ground fault or a short circuit to the operating voltage U B are detected. As soon as one of these cases occurs, the microcontroller switches 80 the relays 56 . 58 over the transistors 76 . 81 and / or via the transistor 82 from. In other embodiments, the transistor 82 omitted.
  • Monitoring the external wiring of the safety relay 22 Cross-circuits can be carried out using two channels according to the procedure described. This is in 2 using a redundant microcontroller 80 ' shown. However, it is preferred that the relay 58 with the help of transistors 76 . 78 briefly parallel to the normally closed contact 24b to turn on by the transistor 76 opened and the transistor 78 is closed. Without cross-circuit in this case should no longer power over the relay 58 flow, because at both connections 70 . 74 of the diode network 62 - 68 the same potential, namely mass. Should, however, at one of the connections 40 . 42 due to a cross-circuit another potential applied, there would be a current flow, with the help of the optocoupler 92 detected and sent to the microcontroller 80 is reported. Also in this case the microcontroller switches 80 the relays 56 . 58 with the help of the transistor 82 from. It is also possible, the potentials at the terminals 36 . 38 by means of a diode network (not shown here) to the relay 56 to compare.

Claims (10)

  1. Safety switching device for fail-safe disconnection of an electrical consumer ( 26 . 28 ), in particular in an automated plant ( 10 ), with a first and a second terminal ( 36 . 38 ) for connecting a first signaling switch ( 24a ), with a third and a fourth terminal ( 40 . 42 ) for connecting a second signaling switch ( 24b ), and with at least a first and a second switching element ( 56 . 58 ), which are adapted to a redundant output switching signal for switching off the consumer ( 26 . 28 ), the first terminal ( 36 ) is assigned a first static potential (U B ), and wherein the third terminal ( 40 ) is assigned a different second static potential, the second terminal ( 38 ) with the first switching element ( 56 ) is coupled such that the first switching element ( 56 ) via the first signaling switch ( 24a ) is connectable to the first static potential (U B ), and wherein the fourth terminal ( 42 ) with the second switching element ( 58 ) is coupled such that the second switching element ( 58 ) via the second signaling switch ( 24b ) is connectable to the second static potential, further comprising a circuit arrangement ( 80 . 86 . 88 . 90 ; 80 . 92 ) for determining at least one further static potential at the second and / or fourth connection terminal ( 38 . 42 ), wherein the circuit arrangement ( 80 . 86 . 88 . 90 ; 80 . 92 ) is adapted to control the redundant output switching signal in dependence on the further static potential, and wherein the circuit arrangement ( 80 . 92 ) a switching unit ( 62 . 64 . 66 . 68 ; 76 . 78 ), which is adapted to the second switching element ( 58 ) briefly parallel to the second signaling switch ( 24b ) to switch.
  2. Safety switching device according to claim 1, characterized in that the circuit arrangement ( 80 . 86 . 88 . 90 ) is adapted to monitor the further static potential relative to the first potential (U B ).
  3. Safety switching device according to claim 1 or 2, characterized in that the first potential is a magnitude high potential and the second potential is a magnitude low potential, and that the circuit arrangement ( 80 . 86 . 88 . 90 ) is adapted to at least one of the switching elements ( 56 . 58 ), if the additional static potential is smaller in magnitude than a defined threshold value.
  4. Safety switching device according to one of claims 1 to 3, characterized in that the at least one further potential, a third static potential at the second terminal ( 38 ) and a fourth static potential at the fourth terminal ( 42 ) includes.
  5. Safety switching device according to one of claims 1 to 4, characterized in that the circuit arrangement ( 80 . 86 . 88 . 90 ) is further adapted to determine the first potential (U B ).
  6. Safety switching device according to one of claims 1 to 5, characterized in that the circuit arrangement ( 80 . 80 ' ) is redundant.
  7. Safety switching device according to one of claims 1 to 6, characterized in that the circuit arrangement ( 80 . 86 . 88 . 90 ; 80 92 ) at least one integrated circuit, in particular a microcontroller ( 80 ) connected to the second and / or fourth terminal ( 38 . 42 ) connected is.
  8. Safety switching device according to one of claims 1 to 7, characterized in that the switching unit ( 62 . 64 . 66 . 68 ; 76 . 78 ) a diode bridge ( 62 - 68 ), in which the second switching element ( 58 ) is arranged.
  9. Safety switching device according to one of claims 1 to 8, characterized in that the circuit arrangement ( 80 . 92 ) a threshold sensor ( 92 ), in particular an opto-coupler, which is designed to determine the further static potential.
  10. Safety switching device according to one of Claims 1 to 9, characterized by an overcurrent detection element ( 84 ), in particular a PTC resistor, which is adapted to at least one of the switching elements ( 56 . 58 ) to open at an overcurrent.
DE102005055325A 2005-11-11 2005-11-11 Safety switching device for fail-safe disconnection of an electrical consumer Expired - Fee Related DE102005055325C5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102005055325A DE102005055325C5 (en) 2005-11-11 2005-11-11 Safety switching device for fail-safe disconnection of an electrical consumer

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
DE102005055325A DE102005055325C5 (en) 2005-11-11 2005-11-11 Safety switching device for fail-safe disconnection of an electrical consumer
CN2006800421220A CN101305439B (en) 2005-11-11 2006-10-19 Safety switching apparatus for the failsafe disconnection of an electrical load
EP06806371A EP1946349B1 (en) 2005-11-11 2006-10-19 Safety switching apparatus for the failsafe disconnection of an electrical load
PCT/EP2006/010056 WO2007054187A1 (en) 2005-11-11 2006-10-19 Safety switching apparatus for the failsafe disconnection of an electrical load
JP2008539283A JP4884478B2 (en) 2005-11-11 2006-10-19 Safety switching device for fail-safe disconnection of electrical loads
ES06806371T ES2401103T3 (en) 2005-11-11 2006-10-19 Safety switching device for error-proof disconnection of an electrical consumer
US12/117,844 US7933104B2 (en) 2005-11-11 2008-05-09 Safety switching apparatus for a failsafe disconnection of an electrical load
HK08112722.2A HK1119289A1 (en) 2005-11-11 2008-11-21 Safety switching apparatus for the failsafe disconnection of an electrical load

Publications (2)

Publication Number Publication Date
DE102005055325B3 DE102005055325B3 (en) 2007-04-12
DE102005055325C5 true DE102005055325C5 (en) 2013-08-08

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DE102005055325A Expired - Fee Related DE102005055325C5 (en) 2005-11-11 2005-11-11 Safety switching device for fail-safe disconnection of an electrical consumer

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US (1) US7933104B2 (en)
EP (1) EP1946349B1 (en)
JP (1) JP4884478B2 (en)
CN (1) CN101305439B (en)
DE (1) DE102005055325C5 (en)
ES (1) ES2401103T3 (en)
HK (1) HK1119289A1 (en)
WO (1) WO2007054187A1 (en)

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JP4884478B2 (en) 2012-02-29
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CN101305439B (en) 2012-01-25
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US7933104B2 (en) 2011-04-26
HK1119289A1 (en) 2009-02-27

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